interface PersonInterface1 {
  name: string;
  age: number;
}
//interface接口与接口用extends 继承，abstract抽象类是用派生implement类继承
interface studentInterface extends PersonInterface1 {
  school: string;
}

const stus: studentInterface = {
  name: "张三",
  age: 18,
  school: "清华大学",
};
